Global Patent Index - EP 4001229 A3

EP 4001229 A3 20220810 - APPARATUS FOR, AND METHOD OF, ROLL FORMING SHEETS OF HIGH REFRACTIVE INDEX GLASS

Title (en)

APPARATUS FOR, AND METHOD OF, ROLL FORMING SHEETS OF HIGH REFRACTIVE INDEX GLASS

Title (de)

VORRICHTUNG UND VERFAHREN ZUR WALZFORMUNG VON GLASSCHEIBEN MIT HOHEM BRECHUNGSINDEX

Title (fr)

APPAREIL ET PROCÉDÉ DE PROFILAGE DE FEUILLES DE VERRE À HAUT INDICE DE RÉFRACTION

Publication

EP 4001229 A3 20220810 (EN)

Application

EP 21206516 A 20211104

Priority

  • US 202063113507 P 20201113
  • NL 2027190 A 20201221

Abstract (en)

A method of forming a glass sheet comprises: (a) forming a ribbon of glass from molten glass with a pair of forming rollers; (b) reducing horizontal temperature variability of the ribbon of glass to be 10 °C or less across 80 percent of an entire width of the ribbon of glass before the ribbon of glass cools to a glass transition temperature; (c) controlling a cooling rate of the ribbon of glass while the ribbon of glass moves vertically downward within a setting zone such that the ribbon of glass has a first average cooling rate before the ribbon of glass cools to the glass transition temperature and a second average cooling rate after the ribbon of glass cools to the glass transition temperature, the first average cooling rate being less than the second average cooling rate; and (d) separating a glass sheet from the ribbon of glass.

IPC 8 full level

C03B 17/06 (2006.01); C03B 13/04 (2006.01); C03B 13/16 (2006.01); C03B 25/12 (2006.01); C03C 1/00 (2006.01)

CPC (source: EP)

C03B 13/04 (2013.01); C03B 13/16 (2013.01); C03B 17/064 (2013.01); C03B 25/12 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 4001229 A2 20220525; EP 4001229 A3 20220810

DOCDB simple family (application)

EP 21206516 A 20211104